It is gravity on earth
4 N upward
No. All objects tend to adhere to their current speed (magnitude and direction), it will only change when a force is being applied on said object.
I think it is because of air resistance. Think about it, when objects fly up in the atmosphere they still must get past the air molecules floating around. The rocket tips being sharper allows the rocket to "slice" in between the molecules, which makes the rocket fly faster and easier. If the top was flat, the rocket would have to "push" the molecules out of the way, which would slow the rocket down.
Yes, of course. If it is accelerating, it follows directly from Newton's Second Law that there is a net force acting on the object.
Upward
It can be, but it isn't always so. It can also be an adjective.Adverb: It spiraled downward. The verb is modified by 'downward'.Adjective: It moved in a downward spiral. The noun 'spiral' is being modified here.
Carcinogenic "applicable" means capable of being applied
Rocket fuel is either liquid or solid. Other kinds are being developed.
The balloon rocket limitation is that it flies without being able to be controlled.
Obviously, it depends on the size of the rocket, and the purpose of why people are being sent into space.
Measure the force being applied and divide by the area it is being applied over.
The fuel being ignited by a spark is what propels a rocket to blast off. The mass and the speed are factors as well.